Description
A denial-of-service vulnerability was identified in Moodle’s TeX formula editor. When rendering TeX content using mimetex, insufficient execution time limits could allow specially crafted formulas to consume excessive server resources. An authenticated user could abuse this behavior to degrade performance or cause service interruption.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | moodle | < 4.5.9, 5.0.0 – < 5.0.5, 5.1.0 – < 5.1.2 | 4.5.9 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | moodle | No fix yet | — |
| Ubuntu Pro 16.04 LTS | moodle | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Packagist | moodle/moodle | >= 5.1.0-beta, < 5.1.2 | 5.1.2 | GHSA-cg8j-5cr2-568q |
| Packagist | moodle/moodle | >= 5.0.0-beta, < 5.0.5 | 5.0.5 | GHSA-cg8j-5cr2-568q |
| Packagist | moodle/moodle | < 4.5.9 | 4.5.9 | GHSA-cg8j-5cr2-568q |
Advisories 1
- WID-SEC-2026-0447 Moodle: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 17, 2026
References
- https://access.redhat.com/security/cve/CVE-2026-26047 vdb-entry
- RHBZ#2440905 issue-tracking